Make sure you have following

PHP 8.1 or 8.2

To upgrade your website follow the steps:

1. Backup your website including files, database, and data files.
2. Download the latest premium version from https://www.openteknik.com/product/view/43/premium-social-network
3. Login to the admin panel of your OSSN site and disable the cache in the menu settings.
4. Extract the downloaded premium files and upload them to your OSSN site.
5. Replace your old files with the new ones.
6. Open your browser and run yourwebsite.com/upgrade/upgrade.php to finish the upgrade
7. Flush cache from admin dashboard.
8. You are ready to go.